Draw a line graph that illustrates the relationship between skin reflectance (high numbers = lighter skin color) and serum folate levels for a population living at a low latitude (or high UV index).

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.

C- a hypothesis or d- an observation